Mud-drum seal



March 14, 1933. M. LIPTAK 1 ,901,462

MUD DRUM SEAL Filed Oct. 15, 1928 6 Sheets-Sheet l Ins/6721501 HAEL UPTAK- March 14, 1933- v LIPTAK 1,901,462

MUD DRUM SEAL Filed Oct. 15, 1928 6 Sheets-Sheet 2 147- roz/vs vs- March 14, 1933. M, LIPTAK 1,901,462

MUD'DRUM SEAL Filed Oct. 15, 1928 e Sheets-Sheet s Jul/an zor Mc/mEL L/PTAK ATTOENEYS March 14, 1933. M, UPTAK 1,901,462

MUD DRUM SEAL Filed 001,. 15, 1928 6 Sheets-Sheet 4 [rm/ama e)? MCHAEL L/PTAK ArrozNE r5 March 14, 1933. M. LIPTAK 1,901,

' MUD DRUM SEAL FiledDct. 15, 1928 I 6 Sheets-Sheet 5 fizmrzior M70145; L/PTAK March 14, 1933 M, UPTAK 1,901,462

MUD DRUM SEAL Filed Oct. 15, 1928 6 Sheets-Sheet 6 Patented Mar. 14, 1933 PATENT; OFFICE 7 MICHAEL LIPTAK, OF ST; PAUL, MINNESOTA MUD-DRUM SEAL:

Application filed October 15, 1928. Serial No. 312,594. 7

This invention relates to improvements in:

boiler setting constructions, and particular- 1y relates to means applied to a bridge wall and cooperative with the 'mud drum to maintain a sealed relation between the two such as will prevent gases from passing from the fire chamber beneath the mud drum, thus eliminating danger of injury to the drum. In the type of water tube boiler shown herein the vibration and expansion of boiler tubes causes lateral horizontal motions of the mud drum, and heretofore has resulted in loosening of the masonry seal between the mud drum and a portion of the bridge wall. It is therefore an object of this invention to provide a flexible joint construction carried by the bridge wall and cooperative with the mud drum in such manner that motions breaking the seal, to permit gases to pass directly from the fire chamber past the bridge wall and beneath the mud drum. Another object of the invention is to provide including elements locked in the wall structure against movement in a horizontal direction, away from the mud drum, and to provide an element socketed in this wall and engaged either directly or indirectly with the mud drum in such manner as to permit movements of the drum and element without breaking the seal between the drum and the cap block. Another object is to provide a construction in which astepped seal is provided between the mud drum and the cap block of the bridge wall, which in conjunction with the movable str-ucture'above mentioned will also permit motions of the mud drum without breaking the seal. Features of the invention include the broad idea of providing a movable sealing connection between the bridge wall and the mud drum, and the specific means for accompl-ishing this result.

Objects and advantages of the invention will appear in the description of the drawings forming a part of this application and in said drawings:

Figure 1 is a vertical transverse section of the mud drum can take place without a cap block construction for the bridge wallthrough a water tube boiler, illustrating'the movable sealing construction between the mud drum and the :bridge wall; Figure 2 is a vertical sectional view substantially on line 22 of Figure l;

Figure 3 is'an enlarged detail horizontal section taken on 1ine"33 of Figure 1, to

show the herein claimed relation of the capblock anchoring and wall re-enforcing, element to the bridgeand side walls of the I furnace structure;

F'gurei is an enlargedsection showing g the bridge wall and mud drumsealing structure, and showsa structure slightly modified overthat of Figure 1; I

Figure 5 is a perspective view illustrating the cap construction of thebridge'wall' and the means for'anchorin-g'it, and correspond- I ingto Figure 1; 7 v Figure 6 isa perspective view of two com- J V plemental. cap elements; 5

Figure 7 is a perspective view of twojcom plemental elements; whichfunctionto form a movable sealing connection between bridge wall and mud drum; a

Figure 8 is. a plan view of two of the coni-v plemental cap blocks, showing how they are shaped fto'int'erlock and to have the inner portions of a minimum width;

Figure 9 is a vertical elevation on line 9 9 of Figure 4, illustrating the relation of the cap and sealing elements; I

Figure 10 is a View showing a modification of the, movable sealing'cap block construction Y Figure 11 is a perspective view further illustrating the cap block construction of Figure 10, andthe means for anchoring it;

Figure 12 is a perspective view of the anchoring portion of the. cap block, corre-- 0 sponding to the construction of Figures 10 and 11'; and 7 v Figure-13 is aview of-t he movable 'portigon of the cap block illustrated in F igure Referring first to Figure 1. The invention is shown applied to that type of water tube boiler which includes a mud drum,

but it is to be understood that although a most valuable application of the invention is herein illustrated, there is no intention to limit the invention, in that it may be applied in other environments wherein a seal is to be maintained between a movable and a relatively stationary element by means of a sealed element mounted to automaticah ly adjustitself upon a relatively permanent portion of a furnace structure} U The numeral 1 generally indicates the wall structure and numerals 2 generally in dicate the steam drums,the steam outlet drum having a suction pipe '3, and the drums beingconnected by the usual pipes honly a few of which are shown. The, mud drum is indicated at 6, the connecting tubes between the mud and steam drums at 7, and the baffles at 8. The fire chamber is indicated at 9, and the bridge wall at 10. It will" besunderstood that it is desirable to prevent leakageeof gas in a direction indicated by the arrows A, to protect the mud drum, prevent blistering thereof, and to prevent lowering of furnace temperature by an es-' cape of gas in the wrong direction. Th'e proper course of the gases is generally indicated by the arrows B.

V The bridge wall with the exception-of the cap block construction, may be of any pre-- ferred construction, but a feature of the invention herein includes the 'cap block construction, and the means for anchoring it,

as well as the cooperative relation of the movable portion of the cap block with the mud drum, providing a joint, movable without leaking, for the horizontal movements .Of the mud drum. 7 r v I The mud drum must be so arranged that itis'free to'move independently of the walls 1, of thefurnace, since if it were immovably set in the walls, said walls would be'quiclrly damaged, and the boiler tubes loosened. For this reason, as shown in Figure 8,

the ends of the mud drum 6 extend into openings formed in the wall, the diameter of the .mud drum being substantially less than the diameter of the opening. Asbestos is used to close't he space between the outer surface of the drum and the inner surface of the sockets or wall openings to prevent -which the ends of the bridge wall are built.

Referring to Figure 3 it will be noted that the channel iron, or equivalent element providing anchoring means extends into the same walls into which the ends of the bridge wall are built, and extends beyond the ends of the bridge wall and is embedded in the furnace walls. By this means the anchoring element for the cap course of the wall is protectingly arranged beneath the cap course, see Figure 4, andas will be noted it is placed at the coolest part of the bridge wall, that is in that margin or adjacent that margin opposite the fire chamberL, By this means the element is arranged so that it can expand independently of the wall, andtherefore'so that the connection between it and the cap course blocks can be maintained under all conditions. v T T I The height of the-channel iron is substantially the height of 'afbrick and a course of bricks 16 is laid as shown to provide a top surface flush with the top surface of the flanges. A cap block 17 has an extension 18 on itslower face and this extension is engaged between the flanges of the iron as shown. -A layer of cement 28 is first ap plied to' the bottom of the channel iron, to

receive and embed this extension. The un dersurface of each block 17 engages the up per surface of the course formed by the bricks 16 and thus the course of blocks 17 are made level'and given a relatively large area of contact, the elements,1518 coopcrating to oppose horizontal movement of the block in a direction toward and away from the mud drum 6. V

The upper surface of each block is provided with a depression 21, and the depressions of the row of blocks together provide an elongated depression extending longitudinally of the wall. It is conceivable that this depression may be formed in other ways.

Another feature of the invention is the shape of the cap course blocks so that they can expand longitudinally of the wall without permitting passage of gas between them. Two of these elements are shown in Figure 8 in top plan. The elements might be considered T-shaped, and each provides lateral shoulders 23, which extend longitudinally of the bridge wall, and which face either -to-; ward the mud drum or toward the fire box. These shoulders are cooperable as shown to permit expansion in a direction lengthwise of the bridge wall but to prevent passage of the gas between the blocks-into the space below the mud drum. By use of the channel iron 15 .or its equivalent and by locking the blocks into the channel iron, the cap course which supports the movable sealing elements forms a unit, which may be considered, for the purposes herein, as expansiblelengthwise and independently of the bridge wall. For this purpose, see Figures 7 and-9,the bridge wall elements 25 are shaped and con nected in the manner of the cap blocks, to permit free. expansion longitudinally, but

prevent passage of gases between the movable bridge wall elements. The shoulders ofthese elements are indicated at 30. The obj ect here is to provide a movable connection between the bridge wall and'the mud drum, such that the sealing relation between the wall and the movable element, and between the movable element and thedrum will never be broken, when the drum moves. To

this end, eachelement 25' is provided with a Thus movement is provided .for between the:

surfaces 2132 and 33 and 6; Moreover the relation of surfaces 35-36is such thatthe element 25 can swing downwardly in clockwise direction upon movement .of the mud drum to the right, pivoting about the curved portion 32. The element 25 has substantially only a point contactwiththei'druin as at" 33, the inner face of the element .25 being cut away as at 37' so that it will not engage the drum. g

Another featureof the invention is the formation of the cap blocks of thewall, and associated movable sealing elements; Referring to Figures 5, 8 and 9, particularly to Figure 5, it will be seen that the widths of the inner portions of the cap blocks or those portions which are most exposed to the heat,

are the same. Furthermore, each. block is provided on each lateral vertical face with a shoulder which cooperates with corre-- sponding opposingly' faced shoulders of a contiguous block to form the sealing joint herebef'ore mentioned. In regard to the movable sealingelements which are socketed in theupper face of the cap blocks, the widths of these blocks are equal to the corresponding portions of the cap blocks. The I,

relations oflthe cap blocks to the movable sealing elements are shown in Figure 9. This is an important feature of theinvention, inasmuch as thoserfaces of the cap block and sealing elements which facethe fire are of a minimum'width, to reduce the area which is exposed to the flame, and thus to reduce erosion and cracking or splitting to the 'minlmum.

The width of each block 17 on the firebox side is four and one-half inches while the width on the opposite side varies fromthree and one-half to five and one-half inches. The width of each element25 is four and one-half inches which corresponds to the width of that portion of the block 17 which faces the fire box. ment of the elements 17 and 25- is best shown in-Figure9."

The uppermost surface of the element 25 is spaced at least an inch below the lower-" The relative arrangemost surface ofthat tube '7 whichis'nearest' the bridge wall so that under no conditions 7 will the tube 7'come in contact with the ele ment 25,thus provision is made for a maXimum expansion without interference with the proper operation of the movable sealing elements.

As before stated, expanding and vibra tory movements are communicated to the mud drum which moves in various. -direc-' tions, principally laterally in a horizontal direction, and when the boiler'is in operation these movements ordinarilyfinally result in breaking of the seal. Consider the mud drum to move to the left, see Figure 4. The element 25 will be rocked in counter clockwise direction, and substantially about the surface 32 as a center, a slippage taking place between the surface 33 and the-drum surface or between 33 and a layer of packing interposed between it and the drum as shown in the modification of Figure 10.

However, contacts 2132 and 33 with the drum will not be broken but the sealed; com nection will always be maintained. Now

consider amovement inthe opposite direction. The element 25 will swing in clock- -wise direction} In this formiof the invenalso claimed herein, it is believed that the invention broadly consists in the provision ofa movable sealing connection between the bridge wall and the mud drum, arranged 'so that the sealing relation is maintained for all motions of the drum. I

In that form of theinvention shown in Figures 10 to 13, inclusive, the cap block 50 is formed to provide, in that surface adjacent the mud drum, a notch or step indicated at '51. The block is anchored by its cooperative relation with the channel iron 15 'in substantially the manner before described. The shape of the'depression in thei upper surface ismodifi-ed to provide two' straight surfaces respectively designated 5253. The movable sealing element 54 has corresponding surfaces respectively designated 5 5- 56. In this instance an inter-seal is provided at 57 by a substance such as asbestos or any suitableflfire-proof material, and the vertical face 58 oftheblock "54 lies rearwardly of thesurface' or step 51, so that two tread portions respecwhen the mud drum moves,efor example to e the left, the block 54- ismoved in a corre- 'sponding directioin'the surfaces 52',55 co operatingto form-a slide. When the mud drum moves in the" opposite direction, the

a 51-59 also function to prevent such downing walls,

' tained at points l59, and when the drum moves in opposite direction the filler again engages the vertical surfaces. The surfaces ward movement of the packing as will permit it to fall from its operative sealing position. v

I claim as my invention:

1; In combination with a a bridge wall having ends extending into two'of the side walls, ,a channel iron upon the bridge wall having its channel side facing upwardly, said iron extending into the said side walls, amud drum, blocks interlocked with the channel iron, and sealing elements swingably socketed in the blocks and engaging the drum.

2. In combination with a furnace including Walls, a bridge wall having ends extending into two of the side walls, a channel iron upon the bridge wall andextending into the said side walls beyond the ends of the bridge wall, a mud drum, blocks interlocked with the channel iron, and sealing elementsswingably'socketed in the blocks and engaging the drum. 7

-3. In combination abridge wall and a mud drum, and a series of refractory elements arranged to engage the bridge wall and the drum and: to be movable m respect to both, said elements having shoulders cooperable to permit expansion in a direction longitudinally of the bridge wall, but to prevent passage of gas between the elements,

when they are slightly separated.

4. In combination with a bridge wall having a channel across its top, and brlcks-in the channel locked against horizontal m0- tion and providing a socket, a mud drum adjacent said wall, and elements swingable in the socket and resting by gravity against the drum. I

'5. Incombination with a bridge wall having a' channel across its top, andobricks in the channel locked against horizontal motion and providing-a socket, a mud drum adjacent said wall,and elements swingable in the socket and resting by gravity against the drum, said bricks being interlocked to form a sealing connection, which will permit expansion lengthwise of the wall and drum but prevent gas leakage.

6. In combination a bridge wall and a mud drum, a course of refractory elements capping the top of the-wall, means securing the elements 'tothe bridge wall against inc-J tions' transversely thereof," said refractory elements having means sealingly interlocking them but permitting expansion lengthwise of the wall and drum without breaking the seal, and elements sealingly engaged with the courseoof' elements and movable ranged with furnace includ 'with respect thereto, and sealingly associ ated withthe idrum at their upper portions but not connected with the'drum, but so armovement thereof no thrust 'is transmitted by the elements to the course of refractory elements, said elements having means sealingly interlocking them but permitting eX- pansion lengthwlse of the capping elements and drum without breaking the seal.

a mud" drum, a course of refractory elementsarranged on the wall, and meansby whloh said elements are secured to the wall against transverse motion, said elements having means yby-which they are sealingly interlocked to permit expansion lengthwise of the wall without breaking the seal, said sealing means including shoulders which slant upwardly and away from the wall and drum, and said elements-cooperating to provide an upwardly faced concavity, and a course of elements sealinglyengaged in the concavity and swingable therein toward and away from the drum and slanting toward the drum and sealingly associated with the drum but not connected to it and arranged so that on movement. of the drum no thrust is transmitted by theelements to the wall,

said elements having sealing means func- ,tionally similar to the first mentioned means and having shoulders which extend in a direction opposite to. that of the first mentioned shoulders. V

9. In combination with abridge wall and a muddrum, two courses of refractory elements arranged on the wall one nearer and one more remote from the drum, means by which that course nearest the drum is secured to the wall against transverse motion, said elements having meansby which they are sealingly interlocked to permit expansion lengthwise of the wall without breaking the seal, said sealing means including "shoulders which'slant upwardly and away from the wall and drum, and said elements cooperating to provide an upwardly faced concavity, and a course of elements sealingly engaged in'the concavity and swingable r therein toward and away fromgthe drum andslanting towardthe drum and sealingly associated with the drum but notc'onnected to it and arranged so that on movement of the drum nothrust is transmitted by the elements to the wall, said elements having sealing means functionally similar to the first mentioned means and having shoulders which extend in a direction opposite to that of the first mentioned shoulders;

In witness whereof, I have hereunto set my hand this 10th day of October 1928.

MICHAEL LIPTAK. 

